Can anyone help me with this question?
Calculate the number of free electrons per metre length of wire if a current of 2.0A produces a drift velocity of 1.0 * 10^-3 ms^-1
I know the answer but I don't understand the method on how to get to it.
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- Thread Starter
- 13-03-2018 20:28
- 13-03-2018 22:22
You have an equation for drift velocity, usually in the form
I = nAqv
In this equation, n is the nº of electrons per unit volume. You've been asked for nº per unit length.
Suppose N is the total number so n = N/vol and Vol of course = length x area
So n = N/(LxA) If you multipy both sides by A (or take the A to the other side)
nA = N/L or in otherwords, nA = number of electrons per unit length.Last edited by phys981; 13-03-2018 at 22:30.